Revolving power-hammer.



PATENTED NOV. 21, 1905. F. F. HARTWIG.

REVOLVING POWER HAMMER.

- APPLICATION FILED NOV. so. 1904.

FRANK F. HARTWIG,

or NEWTON, IOWA.

REVOLVING POWER-HAMMER.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed November 30, 1904. Serial No. 234,966.

To all whom/ it may concern.-

Be it known that I, FRANK F. HARTWIG, a citizen of the United States of America, and a resident of Newton, Jasper county, Iowa, have invented a new and useful Revolving Power-Hammer, of which the following is a specification.

The object of this invention is to provide improved means for forging metal.

My invention consists in the construction, arrangement, and combination of elements hereinafter set forth, pointed out in my claims, and illustrated by the accompanying drawings,in which Figure 1 is a side elevation of the complete machine. Fig. 2 is a plan of the complete machine.

In the construction of the machine, as shown, the numeral designates an anvilstand adapted to be mounted in any desired place and secured in upright position. Any desired form of anvil or die 1 1 may be mounted on the upper end portion of the stand 10 and serve to support the material being forged and in some instances give shape to one face thereof. A bracket 12 is fixed to and extends rearward from the upper end portion of the anvil-stand 10, and a bearingyoke 13 is fixed to the rear end portion of said bracket. The bearing-yoke 13 is provided with-journal-bearings 14 15, and a shaft 16 is mounted for rotation in said journal-bearings. A pulley'or belt wheel 17 is mounted rigidly on a shaft 16 between the bearings 14 and is adapted to be driven by the belt 18, leading from the prime mover. (Not shown.) One end portion of the shaft 16 projects beyond the journalbearing 15, and an arm 19 is rigidly secured at one end to the projecting portion of said shaft and extends at ri ht angles therefrom. The arm 19 leads radially from the shaft 16 a short distance and then is bent laterally and extends in a plane parallel to its first portion, and a hook 20 is formed on and extends laterally from the extremity of said arm. A balancing-weight, half-wheel, or semi-disk 21 is fixed to or formed integrally with the inner end portion of the arm 19, and thereby is mounted rigidly on the shaft 16. A boss, lug, or projection 22 is formed on and projects from the balancing-weight 21, parallel with and outside of the arm 19, and a pin, stud, or journal 23 is mounted in and projects laterally from said lug or projection. A hammer-stem 24 furcate at its rear end is mounted pivotally by means of its rear end portion on the pin or stud 23. The hammer-stem 24 leads from the stud 23 toward and across the arm 19 and is then bent and extends normally parallel with the outer portion of said arm and rests in or on the hook 20 thereof. The hammer-stem 24 extends across the hook 20 and is provided witha head 25, which head may be of any desired shape and may be fitted with any desired face or die 26 for impact with the substance being forged to give shape thereto. An ear 27 is formed on and projects from the lug or projection 22, and a retractile coil-spring 28 is fixed at one end to the extremity of said ear and is fixed at its opposite end to an car 29 on and laterally projecting from the hammer-stem 24. It is the function of the coilspring 28 to draw the hammer-stem into a position of rest on the hook 20, and said spring would yield in the operation of the tool to permit the hammer-stem to unseat from the hook 20.

While my invention relates particularly to the power-hammer and construction thereof, yet I have shown means for controlling the application of the belt 18 to the pulley 17, as follows: A lever 30 is fulcrumed intermediate of its ends on a support 31 and is provided with a flanged pulley 32, engaging the lower portion of the belt 18. A foot-lever 33 is fulcrumed on a support 34, fixed to the base of the anvil-stand 10 and is provided with a foot-piece 35 at one end, the opposite end portion of said lever being connected pivotally to the otherwise free end portion of the lever 30. Normally the belt 18 may run loosely around the pulley 17 and idly revolve the flanged pulley 32, and when it is desired to operate the hammer foot-pressure is applied to the foot-piece 35 to oscillate the lever 33, which in turn oscillates the lever 30 and applies pressure to the belt 18 through said fianged pulley, thereby tightening said belt on the hammer-pulley 17.

In the rotation of the shaft 16 by the belt the hammer is caused to travel in an orbit and impacts with the anvil-face 11 once during each revolution. The hammer remains on or is retarded by its contact with the anvil temporarily, while the arm 19 and proj ection 22 continue rotary movement. In the further rotary movement of the projection 22 the stem 24 is drawn downward and forward sufficiently to draw the hammer 25 off the anvil and permit it to continue rotary movement. The spring 28 is expanded in the forward movement of the projection 22 and ear 27 during the time the hammer is detained on the anvil, and when said hammer slides off the anvil it is drawn forward rapidly and its momentum advanced to the momentum of the balancing-weight 21 by said spring. The arm 19 serves the useful function of preventing undue acceleration of movement on the part of the hammer 25 and also cooperates with the spring 28 and its support in maintaining the desired relation of the hammer relative to the counterbalancingweight.

I do not wish to be understood as limiting myself to the precise construction and arrangement of the parts illustrated and described, since various modifications of several of the parts may be employed efficaciously.

I claim as my invention 1. A powerhammer, comprising an anvilstand, a bracket extending horizontally from said anvil-stand, a shaft mounted for rotation in the outer end of said bracket, a balancing-weight mounted on said shaft, a hammer loosely mounted on said balancingweight eccentric to the shaft, and an arm connected to said balancing weight and adapted to support said hammer at times.

2. A power-hammer, comprising an anvilstand, a bracket thereon, a shaft mounted for rotation on said bracket, a combined bal-' ancing-weight and arm carried by said shaft, a hammer-stem loosely mounted on said balancing-weight eccentric to said shaft, a hook on said arm adapted to be engaged by said hammer-stem, a spring tending to hold said hammer-stem in contact with said hook, and a hammer-head on said stem adapted for impact with an object on said anvil-stand.

Signed by me at Newton, Iowa, this 16th day of March, 1904.

FRANK F. HARTWIG.

Witnesses:

WILBUR S. KELLEY, CHARLES C. KOLPER. 

